Geometry Practice Test 7

Question : 27 of 28

Marks: +1, -0

If the co-ordinates of the diameter of a circle are (4, 7) and (-1, -5) then find its radius.

Solution:

Diameter =

√{(-1-4)^2+(-5-7)^2}

√{(-5)^2+(-12)^2}

√{25+144}

√{169}

= 13 cm
So, radius = 6.5

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