Question

construct a triangle PQR, in which angle Q=60 degree, angle R=75 degree and the sum of all three sides is 12cm.

Answer 1

Answer:

sum of all angles in a triangle =180°

so 1 angel is 60°,2 angel is 75 ° and let the third angel is x.

180=60+75+x

x=180-(60+75)

x=180-135

x=45°

sum of all sides in a triangle is 12

a+b+c=12

a=b=c=12

3a=12

a=12/3

a=4

therefore,three sides of the triangle is 4cm each