Qstnid -A-3- In Rhombus Abcd ; (I) If ∠A = 74° ; Find ∠B And ∠C. (Ii) If Ad = 7.5 Cm ; Find Bc And Cd. (I) If ∠A = 74° ; Find ∠B And ∠C. (Ii) If Ad = 7.5 Cm ; Find Bc And Cd. - 17: Special Types Of Quadrilaterals Class 8 Maths - Icse-viii-mathematics

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ICSE-VIII-Mathematics

17: Special Types of Quadrilaterals Class 8 Maths

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#3
In rhombus ABCD ; (i) if ∠A = 74° ; find ∠B and ∠C. (ii) if AD = 7.5 cm ; find BC and CD. (i) if ∠A = 74° ; find ∠B and ∠C. (ii) if AD = 7.5 cm ; find BC and CD.
Ans : AD || BC
∠A + ∠B = 180°
⇒ 74° + ∠B = 180°
⇒ ∠B = 180° - 74° = 106°

opposite angles of Rhombus are equal.
∠A = ∠C = 74°
Sides of Rhombus are equal.
BC = CD = AD = 7.5 cm (i) ∠B = 106° ; ∠C = 74° (ii) BC = 7.5 cm and CD = 7.5 cm (i) ∠B = 106° ; ∠C = 74° (ii) BC = 7.5 cm and CD = 7.5 cm

#3-i
if ∠A = 74° ; find ∠B and ∠C.
Ans : ∠B = 106° ; ∠C = 74°

#3-ii
if AD = 7.5 cm ; find BC and CD.
Ans : BC = 7.5 cm and CD = 7.5 cm