A triangle with one of its angles measuring 90° (i.e. a right angle) is called a Right Triangle.
Right triangle is also called as right-angled triangle.
In a right triangle, the side opposite to the right angle is the hypotenuse of the triangle and happens to be the longest side. The other two sides are called the
legs of the right triangle.
A right triangle always satisfies the Pythagorean theorem i.e. if h is the hypotenuse length, b is the base length, and p is the perpendicular length in a right triangle, then h2 = b2 + p2
Correct Answer: A
Step 1: In a triangle, if any of the three angles measures 90°, then the triangle is right triangle
Step 2: In the given figure, there are 4 right triangles and they are ΔABC with ∠B = 90°,
ΔBCD with ∠C = 90°, ΔCDA with ∠D = 90° and ΔDAB with ∠A = 90°
Step 3: Hence, there are 4 right triangles in the given rectangle.