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Triangles

Long Answer Type

251.

In the given Fig, two triangles ABC and DBC lie on the same side of base BC. P is a point on BC such that PQ || BA and PR || BD. Prove that: QR || AD.

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Short Answer Type

252.

In the given fig, if ∠P = ∠RTS. Prove that ∆RPQ ~ ∆RTS.

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253. In a ∆ABC, DE || BC, if

DE equals 2 over 3 BC

and area of ∆ABC = 81 cm². Find the area of ∆ADE.

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254.

In the given fig, ST || QR, PS = 2 cm and SQ = 3 cm. What is the ratio of the area of ∆PQR to the area of ∆PST?

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255. Prove that the diagonals of a rectangle bisect each other and are equal.

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256.
In the given Fig. PB and QA are perpendiculars to segment AB. If PO = 5 cm, QO = 7 cm and area ∆POB = 150 cm² find the area of ∆QOA.

In ∆OAQ and ∆OBP, we have
∠A = ∠B [Each equal to 90°]
∠AOQ = ∠BOP [Vert.opp.angles]
Therefore by using AA similar condition, we have
$increment AOQ space equals space increment BOP$
$space space rightwards double arrow space space space space space space space fraction numerator Area left parenthesis increment AOQ right parenthesis over denominator Area left parenthesis increment BOP right parenthesis end fraction equals OQ squared over OP squared$
$rightwards double arrow$ $fraction numerator Area left parenthesis increment AOQ right parenthesis over denominator 150 end fraction equals 7 squared over 5 squared$

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257. In two similar triangles ABC and PQR, if their corresponding altitudes AD and PS are in the ratio 4 : 9, find the ratio of the areas of ∆ABC and ∆PQR.

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258. In ∆ABC shown in Fig, DE || BC. If BC = 8 cm, DE = 6 cm and area of ∆ADE = 45 cm², what is the area of ∆ABC.

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Long Answer Type

259. If D is a point on the side AB of ∆ABC such that AD : DB = 3:2 and E is a point on BC such that DE || AC ; find the ratio of the areas of ∆ABC and ∆BDE.

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