What is the area of the triangle with sides of length $5$5 cm, $6$6 cm and $5$5 cm?

First find the semi-perimeter $s$s.

Hence find the area using Heron's formula.

Find the area of the triangle with side lengths of $5$5 cm, $5$5 cm and $8$8 cm.

Find the area of the triangle with side lengths of $6$6 cm, $5$5 cm and $9$9 cm.

Round your answer to two decimal places.

Find the area of the triangle.

Apply trigonometric relationships, including the sine and cosine rules, in two and three dimensions

Apply trigonometric relationships in solving problems