Question

An advertisement board is in the form of an isosceles triangle with perimeter 36m and each of the equal sides are 13m. Find the cost of painting it at Rs. 17.50 per square meter.

Answer 1

₹2100

Step-by-step explanation:

First get length of base by subtracting length of sides from perimeter in Isoceles triangle 2 sides are equal.

You will get 10 as base.

Then find height of triangle by drawing altitude,in Isoceles triangle median=altitude.

You will get altitude as 12.

Now apply formula

Area of triangle=base×altitude

=12×10=120

Now multiply this with cost

120×17.5=₹2100