Question

4. Choose the correct expansion formulae of (a+b+c)² O 1. a²+b²+c²+2ab+bc+ac O2. a²+b²+c²+2ab+2bc+ac O 3. a²+b²+c²+2ab+2bc+2ac 5. Which of the properties is incorrect. * 1. daigonals of a square are equal in length. 2. Diagonals of a rectangle bisect each other and are congruent. 3. Diagonals of a kite are congruent. 6. If the adjacent sides of a parallellogram are 5 cm and 8 cm then its perimeter is​

Answer 1

Answer:

4) option(3)

(a+b+c)²= a²+b²+c²+2ab+2ac+2ac

5) option(3)

because diagonals of kite are not congruent.

6)2(5+8)=2×13 = 26cm

because in ||gm pair of opposite side are parallel and equal.