Selina Concise Mathematics Class 9 ICSE Solutions Complementary Angles ICSE SolutionsSelina ICSE Solutions APlusTopper.com provides step by step solutions for Selina Concise Mathematics Class 9 ICSE Solutions Chapter 25 Complementary Angles. You can download the Selina Concise Mathematics ICSE Solutions for Class 9 with Free PDF download option. Selina Publishers Concise … [Read more...] about Selina Concise Mathematics Class 9 ICSE Solutions Complementary Angles

# Complementary Angles

## What Are The Different Types Of Angles

What Are The Different Types Of Angles Angle: Two rays with a common end point form an angle. OA, OB are rays & O is end point. Types of Angles In geometry, angles can be classified according to the size (or magnitude) of the angle. Right angle: An angle whose measure is 90°, is called a right angle. Two lines that meet at a right angle are said to be … [Read more...] about What Are The Different Types Of Angles

## Trigonometric Ratios Of Complementary Angles

Trigonometric Ratios Of Complementary Angles We know complementary angles are pair of angles whose sum is 90° Like 40°, 50°, 60°, 30°, 20°, 70°, 15°, 75° ; etc, Formulae: sin (90° – θ) = cos θ, cot (90° – θ) = tanθ cos (90° – θ) = sin θ, sec (90° – θ) = cosec θ tan (90° – θ) = cot θ, cosec (90° – θ) = sec θ Trigonometric Ratios Of … [Read more...] about Trigonometric Ratios Of Complementary Angles