Sides and Angles

Student Name: _____________________________

Date: ________________

Sides and Angles • •

Measure the angles and side lengths of each triangle on Triangles to Measure. Record your measurements in the tables below. Triangle ABC Angle Measure

Side Length

m∠A = _______ °

BC = _______ cm

m∠B = _______ °

AC = _______ cm

m∠C = _______ °

AB = _______ cm

Triangle DEF

Triangle GHI

Angle Measure

Side Length

Angle Measure

Side Length

m∠D = _______ °

EF = _______ cm

m∠H = _______ °

HI = _______ cm

m∠E = _______ °

DF = _______ cm

m∠I = _______ °

GI = _______ cm

m∠F = _______ °

DE = _______ cm

m∠G = _______ °

GR = _______ cm

1. Highlight the smallest angle and the shortest side of each triangle. What do you notice about their relative positions? 2. Highlight the largest angle and the longest side of each triangle. What do you notice about their relative positions?

Communicating about Mathematics If a triangle has two congruent angles, what can you determine about the side lengths opposite of those angles?

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© 2015 Region 4 Education Service Center

Triangles to Measure

A

G

H

E C

B

I

F

D © 2015 Region 4 Education Service Center

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