find the area of an equilateral triangle whose perimeter is 180 cm

find the area of an equilateral triangle whose perimeter is 180 cm '400
90 m, J 10 m
Hence. Area
3/ 30 / 20/3/30/2720
4242
Exercise 4.1
1. Using Heron's formula, find the area of a triangle whose sides are
(ii) 1.8 m, 8 m, 8.2 m
(i) 10 cm, 24 cm, 26 cm
The sides of the triangular ground are 22 m, 120 m and 122 m. Find
cost of levelling the ground at the rate of 20 per ml.
The perimeter ofa triangular plot is 600 m. If the sides are in the ratio
find the area of the plot.
Find the area of an equilateral triangle whose perimeter is 180 cm.
An advertisement board is in the form of an isosceles triangle with
and each of the equal sides are 13 m. Find the cost of painting it
square metre.
triangle and a parallelogram have the same area. The sides of
.48 cm, 20 cm and 52 cm. The base of the parallelogram is 20 cm. Fir
triangle using Heron's formula. (ii) the height of the parallelogram