Find the area of trapezoids. Trapezoid Base of a trapezoid Height of a trapezoid.
What shape do you think this is? The corners have coordinates: P (-5, -5), Q (-30, 10), R (-5, 25),...
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2.4 - Classifying Figures on a Coordinate Grid What shape do you think this is? The corners have coordinates: P (-5, -5), Q (-30, 10), R (-5, 25), S (20, 10) Rectangle Rhombus Square Trapezoid Just guess!
Transcript of What shape do you think this is? The corners have coordinates: P (-5, -5), Q (-30, 10), R (-5, 25),...
2.4 - Classifying Figures on a Coordinate GridWhat shape do you think this is? The corners have coordinates:P (-5, -5), Q (-30, 10), R (-5, 25), S (20, 10)
Rectangle Rhombus Square Trapezoid
Just guess!
Example #1A triangle has vertices at A(-1, -1), B(2, 0) and C(1, 3). What type of triangle is it? Justify your decision.
Right Isosceles Equilateral Scalene
Example #1 cont’d
A (-1, -1)
C (1, 3)
B (2, 0)
Example #1 cont’dAB =
BC =
AB and BC are the same length; Triangle ABC is Isosceles.
Example #1 cont’dSlope =
mAB = =
mBC = =
The slopes of AB and BC are negative reciprocals, so AB is perpendicular to BC. This means that triangle ABC is a right isosceles triangle.
In Summary…• To solve a problem that involves a geometric figure, it is a
good idea to start by drawing a diagram of the situation on a coordinate grid
• Parallel lines have the same slope• Perpendicular lines have slopes that are negative
reciprocals
