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Ex 3.3, 3 (i) - Chapter 3 Class 8 Understanding Quadrilaterals
Last updated at May 29, 2023 by Teachoo
Ex 3.3
Ex 3.3, 1
Ex 3.3, 2 (i)
Ex 3.3, 2 (ii)
Ex 3.3, 2 (iii) Important
Ex 3.3, 2 (iv)
Ex 3.3, 2 (v) Important
Ex 3.3, 3 (i) Important You are here
Ex 3.3, 3 (ii)
Ex 3.3, 3 (iii)
Ex 3.3, 4 Important
Ex 3.3, 5 Important
Ex 3.3, 6
Ex 3.3, 7 Important
Ex 3.3, 8 (i)
Ex 3.3, 8 (ii) Important
Ex 3.3, 9 Important
Ex 3.3, 10
Ex 3.3, 11
Ex 3.3, 12 Important
Chapter 3 Class 8 Understanding Quadrilaterals
Serial order wise
Transcript
Ex 3.3, 3 Can a quadrilateral ABCD be a parallelogram if (i) ∠D + ∠B = 180°?Given a quadrilateral ABCD where ∠D + ∠B = 180° If ABCD is a parallelogram, then Opposite angles of a Parallelogram are equal ∴ ∠B = ∠D Given, ∠D + ∠B = 180° Putting ∠ D = ∠ B ∠B + ∠B = 180° 2∠B = 180° ∠ B = (180°)/2 ∠B = 90° ∴ ∠B = ∠D = 90° So, ABCD is a parallelogram where ∠B = ∠D = 90° which is possible only if ABCD is a square or a rectangle ∴ ABCD may be a parallelogram, But not in all cases.
