Page 31 - NUMINO_WB_5B
P. 31
120-B1-1
The Measure of a Missing Angle in a Triangle
1. Use the following fact to find the measure of the unknown angle.
Example a. b. 25
a 30 a
The sum of the interior
angles of a triangle is 30
180°.
a
60 40
c. d. e.
55 38 21
68 a a a 35
f. 60 g. h.
45 a 77
a
115
25 a
The Measure of a Missing Angle in a Triangle
1. Use the following fact to find the measure of the unknown angle.
Example a. b. 25
a 30 a
The sum of the interior
angles of a triangle is 30
180°.
a
60 40
c. d. e.
55 38 21
68 a a a 35
f. 60 g. h.
45 a 77
a
115
25 a
