Question : $\triangle ABC$ is a triangle. PQ is a line segment intersecting AB in P and AC in Q and PQ || BC. The ratio of AP : BP = 3 : 5 and the length of PQ is 18 cm. The length of BC is:
Option 1: 28 cm
Option 2: 48 cm
Option 3: 84 cm
Option 4: 42 cm
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Correct Answer: 48 cm
Solution : Given: AP : BP = 3 : 5 And PQ = 18 cm Let BC = $x$ cm In $\triangle$APQ and $\triangle$ABC, $\frac{AP}{AB}=\frac{PQ}{BC}$ (since PQ is parallel to base BC) Putting the values, we get: $\frac{3}{8}=\frac{18}{x}$ $\therefore x=\frac{18×8}{3}$ = 48 Hence, the correct answer is 48 cm.
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Question : In a triangle ${ABC}, {AB}={AC}$ and the perimeter of $\triangle {ABC}$ is $8(2+\sqrt{2}) $ cm. If the length of ${BC}$ is $\sqrt{2}$ times the length of ${AB}$, then find the area of $\triangle {ABC}$.
Option 1: $32 \ cm^2$
Option 2: $28 \ cm^2$
Option 3: $16 \ cm^2$
Option 4: $36 \ cm^2$
Question : Triangle ABC and DEF are similar. If AB = 92 cm, BC = 48 cm, AC =120 cm, and the length of the smallest side of triangle DEF is 200 cm, then find the length of the longest side of triangle DEF.
Option 1: 400 cm
Option 2: 225 cm
Option 3: 350 cm
Option 4: 500 cm
Question : In $\triangle {ABC} $, AB = 48 cm, BC = 55 cm and AC = 73 cm. If O is the centroid of the triangle, then the length (in cm) of BO (correct to one decimal place) is:
Option 1: 25.6
Option 2: 24.3
Option 3: 20.4
Option 4: 18.3
Question : In $\triangle$ABC the height CD intersects AB at D. The mid-points of AB and BC are P and Q, respectively. If AD = 8 cm and CD = 6 cm then the length of PQ is:
Option 1: 3 cm
Option 2: 7 cm
Option 3: 9 cm
Option 4: 5 cm
Question : The mid-points of AB and AC of the $\triangle$ABC are P and Q, respectively. If PQ = 6 cm, then the side BC is:
Option 1: 10 cm
Option 2: 12 cm
Option 3: 8 cm
Option 4: 14 cm
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