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Question

Answers

(a) Right angled triangle

(b) Acute angled triangle

(c) Equilateral triangle

(d) None of these

Answer

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As we know that the triangle is a three sided polygon it contains three angles .

From these three line and angle it is divided further Based on angles it is divided into three types ;

Acute angled triangle : The triangle in which all the three angles less than ${90^ \circ }$.

Obtuse angle triangle : The triangle in which one angle is greater than ${90^ \circ }$.

Right angle triangle : The triangle in which one angle is equal to ${90^ \circ }$.${60^ \circ }$

So in the question it is given that the one angle is equal to ${90^ \circ }$ and the other is an acute angle . So from the above theories we know if the one angle of the triangle is equal = ${90^ \circ }$ then it is known by Right angle triangle .

1) Scalene Triangle : In which all the sides are different in length .

2) Isosceles Triangle : In which the two sides of a triangle are equal and the third side is different in length .

3) Equilateral Triangle : In which all the sides are equal in length.In this triangle all the angles are ${60^ \circ }$.