Question

1) find the number of diagonal of octagine and with side 12 cm.<br /><br />2) ABCD is a rhombus P, Q, R, and S are mid point of side AB, BC, CD, and AD respective show that PQRS is a parallelogram.<br /><br />3) Prove that angle sum properties of triangle.​<br /><br /><br /><br />ANSWER ALL QUESTIONS ​

Answer 1

Answer:

For total no of diagonals

using p and c two sides can be selected out of 8 points for diagonals it can be done in

Step-by-step explanation:

• nC2 ways and in this along woth diagonals sides too will be counted so only for diagonals we have nC2 - n i.e
• 8!/6!2! -8
• =28 -8 =20

Answer 2

Answer:

Answer:

For total no of diagonals

using p and c two sides can be selected out of 8 points for diagonals it can be done in

Step-by-step explanation:

nC2 ways and in this along woth diagonals sides too will be counted so only for diagonals we have nC2 - n i.e

8!/6!2! -8

=28 -8 =20

Step-by-step explanation:

Hope this answer will help you.