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What is the area of the triangle ABC?

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What is the area of the triangle ABC?  [#permalink]

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New post 21 Jun 2019, 00:14
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

66% (02:00) correct 34% (01:56) wrong based on 35 sessions

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Re: What is the area of the triangle ABC?  [#permalink]

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New post 21 Jun 2019, 00:54
1
Bunuel wrote:
Image
What is the area of the triangle ABC?


(A) 15

(B) \(15\sqrt{3}\)

(C) \(\frac{5\sqrt{119}}{2}\)

(D) 32.5

(E) 36


Attachment:
Capture1 (1).JPG


The altitude to the base from A will form a 30-60-90 triangle with Hypo as 12. So Other altitude using 1-root3-2 will be 6root3 (as opposite 60degrees) so area is 15root3 IMO B
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Re: What is the area of the triangle ABC?  [#permalink]

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New post 21 Jun 2019, 02:18
1
Bunuel wrote:
Image
What is the area of the triangle ABC?


(A) 15

(B) \(15\sqrt{3}\)

(C) \(\frac{5\sqrt{119}}{2}\)

(D) 32.5

(E) 36

Attachment:
The attachment Capture1 (1).JPG is no longer available



Image

Draw a perpendicular from point C to meet side AB at point D

CDB is a 30-60-90 triangle with
∠C = 30 deg, ∠D = 90 deg & ∠B = 60 deg

--> BD: CD: BC = 1: \(\sqrt{3}\): 2
--> BD = k, CD = \(\sqrt{3}\)k, BC = 2k
Given BC = 2k = 5
--> k = 5/2

Altitude = \(\sqrt{3}\)k = 5/2*\(\sqrt{3}\)

Area of triangle ABC = 1/2*base*height = 1/2*AB*CD
= 1/2*12*5/2*\(\sqrt{3}\)
= 15\(\sqrt{3}\)

IMO Option B

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Re: What is the area of the triangle ABC?  [#permalink]

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New post 21 Jun 2019, 02:44
1
Bunuel wrote:
Image
What is the area of the triangle ABC?


(A) 15

(B) \(15\sqrt{3}\)

(C) \(\frac{5\sqrt{119}}{2}\)

(D) 32.5

(E) 36


Attachment:
The attachment Capture1 (1).JPG is no longer available


AD= 6 Root(3) by 60-90-30 Triangle Properties

Now, Area= (1/2) * 5 * 6(Root 3)
Attachment:
Capture.PNG
Capture.PNG [ 44.3 KiB | Viewed 368 times ]

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Re: What is the area of the triangle ABC?   [#permalink] 21 Jun 2019, 02:44
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