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4. Triangles
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Q8 of 168 Page 5

ABC is a triangle in which = 90°, , BC = 12 cm and AC = 5 cm. Find the ratio of the areas of .

In Δ ANC and Δ ABC

<C = <C (Common)

<ANC = <BAC (Each 90°)

Then, Δ ANC ~ Δ ABC (By AA similarity)

By area of similarity triangle theorem.

Area of ΔABC/Area of ΔPQR = AC2 /BC2

Or, 52/122

Or, 25/144

More from this chapter

All 168 →
6

The areas of two similar triangles are 25 cm2 and 36 cm2 respectively. If the altitude of the first triangle is 2.4 cm, find the corresponding altitude of the other.

7

The corresponding altitudes of two similar triangles are 6 cm and 9 cm respectively. Find the ratio of their areas.

9

In Fig. 4.178,

(i) If DE = 4 cm, BC = 6 cm and area () = 16 cm2, find the area of .


(ii) If DE = 4 cm, BC = 8 cm and area () = 25 cm2, find the area of .


(iii) If DE : BC = 3 : 5. Calculate the ratio of the areas of and the trapezium BCED.


10

In , D and E are the mid-points of AB and AC respectively. Find the ratio of the areas of .

Questions · 168
4. Triangles
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