Question

If the length of the sides of a triangle are 3, 4 and 5 units, then R (the circum-radius) is

• A. 2.0 unit
• B. 2.5 unit
• C. 3.0 unit
• D. 3.5 unit

Answer 1

Answer: (B)

2.5 unit

Answer 2

Given, Sides are 3, 4, 5.

Since $3 ^ { 2 } + 4 ^ { 2 } = 5 ^ { 2 }$. So, triangle is a right angle triangle.

$R = \frac { 5 } { 2 } = 2.5$ unit .