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Part A
Two sides are equal.
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A triangle is only known as isosceles, When It's two sides are equal . So the answer is way too obvious .
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Part B
All sides are equal.
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A triangle is only known as equilateral, When It's all sides are equal .
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Part C.
An acute angle is that angle which is less than 90° and more than 0°.
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Part D.
Right angle is that angle which exactly 90° nether more nor less .
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Part E :-
An acute angle is that angle which is more than 90° and less than equal to 180°.
