Explanation

A rectangle is a quadrilateral with four right angles, and each internal angle measures 90 degrees.
So:
90° + 90° + 90° + 90° = 360° (sum of interior angles of any quadrilateral)

Explanation

The study of triangles is called trigonometry.

This branch of mathematics focuses on the relationships between the angles and sides of triangles, particularly right-angled triangles

Explanation

√3, √4, √5 →  3+4=7 =5 Not valid

Explanation

Let angle = $x$
Complement = $90 - x$, Supplement = $180 - x$
Given:

$$6(90 - x) = 2(180 - x) - 12 \ 540 - 6x = 360 - 2x - 12 \ 540 - 6x = 348 - 2x \ 192 = 4x Rightarrow x = 48$$

$$540-6x=360-2x-12$$

$$540-6x=348-2x$$

$$192=4x\Rightarrow x=48$$

Explanation

Perimeter of Rhombus  = 2 (l +b)

                                         = 2 ( 6 +6 )

                                         = 2 (12)

                                         = 24