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Triangles

Long Answer Type

231.

In the given fig, PS is the bisector of ∠QPR of ∆PQR. Prove that $QS over SR equals PQ over PR.$

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232.

In the given fig., D is a point on hypotenuse AC of ∆ABC, DIM ⊥ BC and DN ⊥ AB.
Prove that:
(i) DM² = DN × MC.
(ii) DN² = DM × AN.

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Short Answer Type

233.

In the given fig., ABC is a triangle in which ∠ABC > 90° and AD ⊥ CB produced. Prove that AC² = AB² + BC² + 2 BC . BD.

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234.

In the given Fig, ABC is a triangle in which ∠ABC < 90° and AD ⊥ BC. Prove that AC²= AB² + BC² - 2 BC.BD.

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Long Answer Type

235.

In the given fig, AD is a median of a triangle ABC and AM ⊥ BC. Prove that:
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(iii) $AC squared plus AB squared space equals space 2 AD squared plus 1 half BC squared.$

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236. Prove that the sum of the squares of the diagonals of a parallelogram is equal to the sum of the squares of its sides.

Given: ABCD is a parallelogram in which AC and BD are diagonals which intersect each other at O.
To Prove: AB² + BC² + CD² + DA² = AC² + BD²Proof: Since diagonals of parallelogram bisect each other.
Therefore, BO and DO are medians of ∆ABC and ∆ADC, respectively.
We know that the sum of the squares of any two sides is equal to twice the square of half of the third side together with twice the square of the median which bisects the third side.
Now, in ∆ABC,
∵ OB is a median
Given: ABCD is a parallelogram in which AC and BD are diagonals which

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237.

In the given fig, two chords AB and CD intersect each other at the point P. Prove that:
(i) ∆APC ~ ∆DPB.
(ii) AP . PB = CP . DP

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238.

In the given Fig, two chords AB and CD of a circle intersect each other at the point P (when produced) outside the circle. Prove that
(i) ∆PAC ~ ∆PDB.
(ii) PA. PB = PC . PD.

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239.

In the given fig, D is a point on side BC of ∆ABC such that $BD over CD equals AB over AC.$ Prove that AD is the bisector of ∠BAC.

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240. Nazima is fly fishing a stream. The tip of her fishing rod is 1.8 m above the surface of the water and the fly at the end of the string rests on the water 3.6 m away and 2.4 m from a point directly under the tip of the rod. Assuming that her string (from the tip of her rod to the fly) is taut, how much string does she have out (see Fig. 6.73)? If she pulls in the string at the rate of 5 cm per second, what will be the horizontal distance of the fly from her after 12 second ?

2516 Views