Summary Geometric Figures

1




GEOMETRIC FIGURES 1


Triangles

Supplementary and Complementary Angles




If the sum of the measures of two angles is 180°, then the angles are

supplementary.
If angle A and angle B are supplementary, then ∠ ∠
A + B = 180°

If the sum of the measures of two angles is 90°, then the angles are

complementary.
If angle A and angle B are complementary, then ∠ ∠
A + B = 90°




Equilateral triangles vs. Isosceles triangle

B B




A C A C
b




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Isosceles triangles Equilateral triangles
Two equal sides All three sides are equal

Base angles are equal All three angles = 60°




Question 1


^ ^
Construct ΔDEF with EF = 7 cm, E = 50° and F = 50°.
^
Also construct ΔJKL with JK = 6 cm, KL = 6 cm and J = 70°.




Measure and label all the sides and angles of each triangle.




These are triangles, because




.




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