# CBSE Class 10 Answered

**Two angles of a triangle are 70° and 80° The vertices of the triangle are on a circle of radius 3.5cm construct the triangle.**

Asked by lijimoljayan | 12 Sep, 2021, 18:26: PM

Expert Answer

This construction of triangle is made using the sine rule of Triangle as given below

where a , b and c are sides of triangle . A, B and C are angles as shown in figure. R is radius of circumcircle.

Angles of triangle are , A = 30

^{o }, B = 70^{o}and C = 80^{o}a = 2R sin(A) = 7 × sin(30) = 3.5 cm

b = 2R sin(B) = 7 × sin(70) = 6.6 cm

c = 2R sin(C) = 7 × sin(80) = 6.9 cm

To get the required triangle , we construct the triangle with sides 3.5 cm, 6.6 cm and 6.9 cm

Answered by Thiyagarajan K | 16 Sep, 2021, 22:50: PM

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