Question

only answer for 7and 8​

Answer 1

$\sf\underline{Equilateral~triangle:}$

Equilateral triangle is a triangle in which all three sides are of equal length. And all three angles are equal to 60°

$\sf\underline{Scalene~triangle:}$

A triangle which has no three sides of equal length is called scalene triangle. All angles are of different measures.

$\sf\underline{Area~of~right~angled~triangle:}$

$area = \frac{1}{2} \times base \times perpendicular$

[Area of a normal triangle is 1/2×b×h, in a right angle triangle, height is equal to perpendicular hence the formula]

$\sf\underline{Sum~of~interior~angles~of~quadrilateral:}$

The sum of interior angles of a quadrilateral would always be 360°