Page 172 - TB_5B

NUMINO

c. The sum of all the interior angles of a triangle
is 180Ø.
130Ø 50Ø
The sum of the interior angles of a
quadrilateral is 360Ø.

Activity 1 P. 12~13

60Ø AB
60Ø
abcde f
a 50Ø, b 60Ø Angle 70 65 45 45 90 45
Measure ( )
a+ b
50Ø+ 60Ø Sum of the 180 180
110Ø Interior Angles ( )

d. 70Ø C
a
l gh i
25 45 110
Angle
Measure ( )

Sum of the 180
Interior Angles ( )

m 120Ø 60Ø 1 . a . 45 b . 104 c . 20
d . 60 e . 81 f . 29
a = 60Ø
= 180Ø 70Ø a 2 . a . 180 b . 360
= 180Ø 70Ø 60Ø
= 50Ø Activity 2 P. 14~15

Unit 18. The Sum of the Angles in a Polygon Angle AB
Measure ( )
P. 10~11 abcde f gh
90 90 90 90 70 70 65 155

Sum of the 360 360
Interior Angles ( )

Angle C
Measure ( )
i jkl
110 70 110 70

Sum of the 360
Interior Angles ( )

1 . a . 110 b . 150 c . 118
d . 55 e . 100 f . 82

Answers 161