Use the properties of triangle to find the unknown angle
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Triangle Properties
Scalene Triangle: All the sides , angles are unequal.
Isosceles Triangle: It has two equal sides with the angles opposite these equal sides are equal.
Equilateral Triangle: All the sides are equal or all the 3 angles equal to 60°.
Acute Angled Triangle: A triangle having all its angles less than 90°.
Right Angled Triangle: A triangle having 1 of 3 angles exactly 90°.
Obtuse Angled Triangle: A triangle having 1 of 3 angles more than 90°.
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