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E23 Math
Question 39
2021 December(E23) Math Question 39
Angles
- Collinear Points & Triangles
Sum of angles of a triangle
Choice D
∠
B
=
90
o
\angle B=90^o
∠
B
=
9
0
o
∠
A
=
150
o
−
114
o
=
36
o
\angle A=150^o-114^o=36^o
∠
A
=
15
0
o
−
11
4
o
=
3
6
o
∴
∠
C
=
180
o
−
90
o
−
36
o
=
54
o
\therefore \angle C=180^o-90^o-36^o=54^o
∴
∠
C
=
18
0
o
−
9
0
o
−
3
6
o
=
5
4
o
Skills you are tested for:
Sum of angles of a triangle
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