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# What is the perimeter of triangle ABC?

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Math Expert
Joined: 02 Sep 2009
Posts: 60678
What is the perimeter of triangle ABC?  [#permalink]

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28 Jan 2019, 02:34
00:00

Difficulty:

15% (low)

Question Stats:

84% (00:46) correct 16% (01:03) wrong based on 23 sessions

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What is the perimeter of triangle ABC?

A. 8
B. 9
C. 10
D. 11
E. 12

Attachment:

Capture (1).JPG [ 19.25 KiB | Viewed 464 times ]

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

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28 Jan 2019, 02:43
Bunuel wrote:

What is the perimeter of triangle ABC?

A. 8
B. 9
C. 10
D. 11
E. 12

Attachment:
Capture (1).JPG

Sum of angles of triangle =180

Third angle = 180-75-30 = 75

So this is an isosceles triangle with sides as 4,4 & 3

Perimeter = 4+4+3 = 11

Hence D
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Re: What is the perimeter of triangle ABC?  [#permalink]

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28 Jan 2019, 03:52
Bunuel wrote:

What is the perimeter of triangle ABC?

A. 8
B. 9
C. 10
D. 11
E. 12

Attachment:
Capture (1).JPG

isosceles triangle : 75:75:30
4+4+3 = 11
IMO D
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Re: What is the perimeter of triangle ABC?  [#permalink]

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28 Jan 2019, 04:09
Bunuel wrote:

What is the perimeter of triangle ABC?

A. 8
B. 9
C. 10
D. 11
E. 12

Attachment:
Capture (1).JPG

30 + 75 + x = 180

x = 75.

That means both legs are equal and have the same length.

4 + 4 + 3 = 11.

Re: What is the perimeter of triangle ABC?   [#permalink] 28 Jan 2019, 04:09
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