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18 Dec 2017, 21:41
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
92% (00:22) correct
8%
(00:43)
wrong
based on 92
sessions
History
Date
Time
Result
Not Attempted Yet
What is the area of the triangle in the figure above?
(A) 4.0
(B) 7.5
(C) 8.0
(D) 8.5
(E) 15.0
Attachment:
2017-12-19_0836_002.png [ 8.18 KiB | Viewed 2515 times ]
19 Dec 2017, 00:45
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Bunuel
Base of the triangle = Distance between (0,0) and (5,0) = 5 units
Height of the triangle = Distance between (0,0) and (0,3) = 3 units
Area of triangle = (1/2)*Base*Height = (1/2)*5*3 = 7.5
Answer: option B
19 Dec 2017, 10:45
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Bunuel
Area of a triangle: \(\frac{base*height}{2}\)
Distance between a point and the origin (0,0): \(\sqrt{x^2+y^2}\)
Base: \(\sqrt{x^2+y^2}=\sqrt{5^2+0^2}=5\)
Height: \(\sqrt{x^2+y^2}=\sqrt{0^2+3^2}=3\)
Area of a triangle: \(\frac{(5*3)}{2}=7.5\)
(B) is the answer.
