Do Now 05/02/2014
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Transcript of Do Now 05/02/2014
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Do Now 05/02/2014Find the unknown side length in each right triangle with legs a and b and hypotenuse c.
1. a = 20, b = 21
2. b = 21, c = 35
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9.1 Developing Formulas for Triangles and Quadrilaterals
Objective: Develop and apply the formulas for the areas of triangles and special quadrilaterals.
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Let’s Talk Common Sense Area
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Tangram7 shapes that fit together to make a square…yet it turned into a type of art.
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Solve a TangramA tangram is an ancient Chinese puzzle made from a square. The
pieces can be rearranged to form many different shapes.http://pbskids.org/cyberchase/math-games/tanagram-game/
FOX
How Would we find the area of the whole Fox?
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Area Addition Postulate
The area of a region is equal to the sum of the areas of its non- overlapping parts
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Recall that a rectangle with base b and height h
has an area of A = bh.
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Area of a ParallelogramThe area of a parallelogram with base b and height h is
Area=bhb= base (long side)H= height (vertical,not slanted)*Remember that rectangles and squares are also parallelograms.
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Pythagorean Theorem
• If you have a right triangle, a2 + b2 = c2 where c is the hypotenuse
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Example 1: Find the area
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Example 2: Find the area of the parallelogram
Step 1: Use the Pythagorean Theorem to find the height h.
Step 2 Use h to find the area of the parallelogram
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Example 3Find the height of a rectangle in which b = 3 in. and A = (6x² + 24x – 6) in2.
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Example 4• Find the perimeter of the rectangle, in which A = (79.8x2 – 42) cm2
Step 1 Use the area and the base to find the height.
Step 2 Use the base and the height to find the perimeter.
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Check For Understanding
Find each measurement.
• 1. the height of the parallelogram, in whichA = 182x2 mm2
2. the perimeter of a rectangle in which h = 8 in. and A = 28x in2
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Check For understanding
3) Find the base of the parallelogram in which h = 56 yd and A = 28 yd2.
4) Find the area of a square with one side length of 4x-2 in2.
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Area of Triangles and Trapezoids
•The area of a triangle or trapezoid is half the area of the related parallelogram.
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Area: Triangles and TrapezoidsA= ½ bh A=½(B1+B2)H
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Example 1a) Find the area of a trapezoid in which b1 = 8 in., b2
= 5 in., and h = 6.2 in.
b) Find the area of a triangle where b= 2x and h= 25
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Example 2• Find the base of the triangle, in which A = (15x2) cm2, when h= 10x cm.
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Example 3• Find b2 of the trapezoid, in which A = 231 mm2.
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Check For understanding
1) Find the area of the triangle.( use Pythagorean THM. to find b 1st)
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Check For understanding
2) Find the area of the trapezoid
• 3) Find the base of a triangle in which h = 8 cm and A = (12x + 8) cm2
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10 minute Break
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RecallThe diagonals of a rhombus and kite are perpendicular, and the diagonals
of a rhombus bisect each other.
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Area: Rhombi and Kites
A= ½ d1d2
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Example 1Find d2 of a kite in which d1 = 14 in. and A = 238 in2.
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Example 2• Find the area of a rhombus.
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Example 3Find the area of the kite
• Step 1 The diagonals d1 and d2 form four right triangles. Use the Pythagorean Theorem to find x .
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Example 3 Continued
• Step 2 Use d1 and d2 to find the area. d1 =48 , d2 =42.
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Warm – Up1)Identify the base and height of the parallelogram
b= h=2)Find the area of the parallelogram 5x+4 in.
12 x in.
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Check For Understanding
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Check For Understanding
3) Find the d2 of the rhombus.
4) Find d2 of a rhombus in which d1 = 3x m and A = 12xy m2.
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HomeworkPractice A 1-11( No Variables ! )
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Make your own formula sheet
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Do Now • 10x
)
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Check Homework
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Self Quiz
60 in
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Bell RingerState the area formulas for
quadrilaterals and triangles in the grid on your worksheet.
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Angry Area
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Rules-Each question is worth 100 points
-When your team has an answer, you are allowed to ring in once.
-If you are incorrect, you lose 50 points and the remaining teams have 1 minute to
answer. (keep working)- team with most points at the end wins!
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1)Find each measurement
The perimeter of the rectangle:
( x-1) in.
( 2x+2) in.
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2)Find each measurement
The area of a parallelogram in which
b= (x+5)ft and h= (2x-1) ft.
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3)Find each measurement
•
2 m
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4)Find each measurement
The area of the whole triangle
25 in.17 in.15 in.
8 in.
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5) Find the measurement
•
4 cm.
10 cm.
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6) Find the measurement
The area of a trapezoid :
20 m.
15 m.
9 m.
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7) Find the measurement
The area of a triangle in which b= (x+1) ft and h= 8x ft
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8) Find the measurement
•
2x ft.
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9) Find the measurement
•
6x ft.
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10 ) Find the measurement•