Question : If in triangle ABC, MN is parallel to BC, and M and N are points on AB and AC respectively. The area of quadrilateral MBCN = 130 cm2. If AN : NC = 4 : 5, then the area of triangle MAN is:
Option 1: 40 cm2
Option 2: 65 cm2
Option 3: 32 cm2
Option 4: 45 cm2
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Correct Answer: 32 cm2
Solution : Given that MN is parallel to BC, triangle ABC is similar to triangle MAN. The ratio of their areas is the square of the ratio of their corresponding sides. ⇒ AN : NC = 4 : 5 ⇒ AC = AN + NC = 4 + 5 = 9 Therefore, the ratio of the areas of triangle MAN to triangle ABC, $(\frac{AN}{AC})^2 = \frac{4}{9}= \frac{16}{81}$ The area of quadrilateral MBCN is the area of triangle ABC minus the area of triangle MAN. The area of triangle MAN is 16 units and the area of triangle ABC is 81 units, then the area of quadrilateral MBCN = 81 – 16 = 65 units. Given that the area of quadrilateral MBCN is 130 cm2, ⇒ 65 units = 130 cm2 ⇒ 1 unit = 2 cm2 Therefore, the area of triangle MAN = 16 units × 2 cm2/unit = 32 cm2 Hence, the correct answer is 32 cm2.
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Question : In triangle ABC, AD BE and CF are the medians intersecting at point G and the area of triangle ABC is 156 cm2. What is the area (in cm2) of triangle FGE?
Option 1: 13
Option 2: 26
Option 3: 39
Option 4: 52
Question : In $\triangle$ABC, the straight line parallel to the side BC meets AB and AC at the points P and Q, respectively. If AP = QC, the length of AB is 16 cm and the length of AQ is 4 cm, then the length (in cm) of CQ is:
Option 1: $(2 \sqrt{21}+2)$
Option 2: $(2 \sqrt{18}-2)$
Option 3: $(2 \sqrt{17}-2)$
Option 4: $(2 \sqrt{19}+2)$
Question : Two triangles XYZ and UVW are congruent. If the area of $\triangle$XYZ is 58 cm2, then the area of $\triangle$UVW will be:
Option 1: 58 cm2
Option 2: 116 cm2
Option 3: 29 cm2
Option 4: 15 cm2
Question : If in a $\triangle$ABC, D and E are on the sides AB and AC, such that, DE is parallel to BC and $\frac{AD}{BD}$ = $\frac{3}{5}$. If AC = 4 cm, then AE is:
Option 1: 1.5 cm
Option 2: 2.0 cm
Option 3: 1.8 cm
Option 4: 2.4 cm
Question : The sides of a triangle are of length 8 cm, 15 cm, and 17 cm. Find the area of the triangle.
Option 1: 65 cm2
Option 2: 75 cm2
Option 3: 60 cm2
Option 4: 70 cm2
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