Question

Q1.The angles of a triangle are in the ratio 5 : 3 : 7. The triangle is
(A) an acute angled triangle
(B) an obtuse angled triangle
(C) a right triangle
(D) an isosceles triangle

Answer 1

Step-by-step explanation:

Ok solution is

3x + 5x + 7x = 180° (∆ Sum Property)

15x = 180

$x = \frac{180}{15} = 12$

X = 12°

First angle 5x = 12 × 5 = 60°

Second Angle 3x = 12 × 3 = 36°

Third Angle 7x = 12 × 7 = 84°

Therefore all angles are below 90°

So correct answer is (A) Acute - Angled Triangle

Hope it helps :)