Answer:
An isosceles triangle is a triangle that has two sides of equal length.
An acute triangle is a triangle with three acute angles (less than 90°).
A scalene triangle has all its sides of different lengths. Equivalently, it has all angles of different measure.
An equilateral triangle is a triangle in which all three sides are equal.
Only option (A) is incorrect.
So , true statements are (B), (C) &(D).
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1. 8
2. 21÷3=7
3. 5x6=30
4. 7