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Question

∆ABC is constructed such that AB = 7 cm, AC = 4 cm and ∠A = 75⁰. Then find the length of side BC.

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Solution

Step 1:
Draw the base line AB of the length 7 cm.

Step 2:
Measure the angle A with your protractor. Make a mark at 75⁰ and draw a line from A passing through the mark.

Step 3:
Cut an arc of radius 4 cm on the line passing through the point A. The point where this arc cuts the line is the point C.

Step 4:
Draw a line from B to point C to get the required ∆ABC, as shown below.

From the above construction, we see that length of side BC is 7.1 cm.


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