Question

12. The length of each equal side of an isosceles triangle is 20m and the angle included between them is 45°. Let us write by calculating the area of triangle.
Don't use trigonometric equations; answer= 100
$\sqrt{2}$

Give $\huge\mathcal{\pink{A}}\huge\mathcal{\purple{N}}\huge\mathcal{\green{S}}\huge\mathcal{\blue{W}}\huge\mathcal{\red{E}}\huge\mathcal{R}$​

Answer 1

Answer:

Given, length of equal sides of triangle = 20m

Angle between the equal sides = 45°

Area of a isosceles triangle with two equal sides and angle between them

=

, where s is the length of equal sides and θ is the angle between them

Here

Area of isosceles triangle =

=

(∵

)