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Equilateral Triangle

An equilateral triangle is a triangle of three equal sides.

In the adjacent figure, triangle ABC is an equilateral

triangle; because, AB =BC =CAi.e., the lengths of

three sides are equal.

Isosceles Triangle

An isosceles triangle is triangle with two equal sides. In

the adjacent figure triangle ABC is an isosceles

triangle; becauseAB =AC zBC i.e., the lengths of

only two sides are equal.

Scalene Triangle

Sides of scalene triangle are unequal. Triangle ABC is

a scalene triangle, since the lengths of its

sidesAB,BC,CA are unequal.

Acute Angled Triangle

A triangle having all the three angles acute is acute

angled triangle. In the triangleABC each of the angles

BAC, ABC and BCA is acute i.e., the

measurement of any angle is less than 90q. So 'ABC is

acute angled.

Right Angled Triangle

A triangle with one of the angles right is a right angled

triangle. In the figure, theDFE is a right angle; each

of the two other angles DEF and EDFare acute.

The triangle'DEF is a right angled triangle.

Obtuse angled triangle

A triangle having an angle obtuse is an obtuse angled

triangle. In the figure, the GKH is an obtuse angle;

the two other anglesGHK andHGK are acute.

'GHKis an obtuse angled triangle.