A right triangle with lengths of perpendicular sides 8 cm and 4 cm is constructed. Then the perimeter of this triangle is

21.8 cm

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20.9 cm

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16.9 cm

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15.8 cm

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Solution

The correct option is B
20.9 cm

Step 1:

Draw a pair of perpendicular lines and name the point where they meet as A.

Step 2:

Mark B on one of the lines, 8 cm from A and mark C on the other line, 4 cm from A.

Step 3:

Join the points B and C to get the required right angles triangle.

From the above construction, we see that the length of side BC is 8.9 cm

Then the perimeter of this triangle is
4 cm + 8 cm + 8.9 cm = 20.9 cm

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