Question

Which of the following shape must not have a right angle ? Option (a) A right triangle (b) Square (c) Rectangle (d) none of these​

Answer 1

Option d. As a triangle can have right angles

Answer 2

(d) None of these option is correct, because a right triangle, square, rectangle have a right angle.

Explanation:

• An angle that has a measure of 90° is called as right angle.
• In a square all the four sides are equal and the angle of four sides are equal.
• The angle of four sides of a square is 90°, therefore, it has four right angles.
• In a right triangle, one angle is equal to 90°, which means it has one right angle.
• In a rectangle, the angles are congruent and opposite sides are parallel.
• Therefore, the measure of four angles in a rectangle is 90°, which is a right angle.
• Thus, option d is correct.