b. ABC is an isosceles triangle with AB=AC=13cm and BC =5cm.
Find the altitude on BC and calculate the area of the triangle.
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Step-by-step explanation:
we know that in isosceles triangle two line are same so....there will be two angel will be same..so we cay say that...angel is 60°
let AD is the altitude on the BC
so by triangle property
tan60°=x/(5/2)
2x=5√3
x=5√3/2
area of triangle= 1/2 ×base × hight
= 1/2× 5× 5√3/2
=25√3/4
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