D = 90 This is because any line is equal to 180 degrees, we see that d is situated on a line that continues into another angle, the other angle is 90 degrees, so we minus 90 from 180, to get 90.
E = 99 E is situated on a line with the other angle F, F = 81 (see below) so we minus 81 from 180
F = 81 F is situated on a line, we minus it from the other angle situated on the same line, so we minus 99 from 180to get 81
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Area of a circle is π*r² sub what we're given 49π= πr² 49π= π*r² r²= 49π/π r²=49 r=7 The diameter is twice the radius therefore the diameter is 14 units
