Author: Francesca Marsiand

LO: To find the missing angle from a triangle.
DO NOT measure these angles—they are NOT drawn accurately.
Instead, use our method that we discussed. Please write the answers in your books.

22º

A

42º

B

68º

C

60º

60º

32º

40º

E

121º

D

45º

50º

109º

F

75º

62º

G

15º

H

12º

88º

I

113º

90º

Extension 1: Write a definition for each of these types of triangles: Isoceles, Right-Angled, Equilateral and Scalene.
Extension 2: Collect a 2D shape. What do each of its angles add up to? Try another shape with the same amount of sides. Is there a pattern?