हिंदी

Diagonals of a rectangle ABCD intersect at point O. If AC = 8 cm then find BO and if ∠CAD =35° then find ∠ACB.

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प्रश्न

Diagonals of a rectangle ABCD intersect at point O. If AC = 8 cm then find BO and if ∠CAD =35°  then find ∠ACB.

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उत्तर

AC = 8 cm     ...(i)  ...[Given]

`square`ABCD is a rectangle    ...[Given]

∴ BD = AC     ...[Diagonals of a rectangle are congruent]

∴ BD = 8 cm      ...[From (i)]

BO = `1/2` BD       ...[Diagonals of a rectangle bisect each other]

∴ BO = `1/2` × 8

∴ BO = 4 cm

side AD || side BC and seg AC is their transversal.      ...[Opposite sides of a rectangle are parallel]

∴ ∠ACB = ∠CAD     ...[Alternate angles]

∠ACB = 35°        ...[∵ ∠CAD = 35°]

∴ BO = 4 cm, ∠ACB = 35°

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अध्याय 5: Quadrilaterals - Practice Set 5.3 [पृष्ठ ६९]

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बालभारती Mathematics 2 [English] Standard 9 Maharashtra State Board
अध्याय 5 Quadrilaterals
Practice Set 5.3 | Q 1 | पृष्ठ ६९

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