Question

PLEASE HELP ME ON BOTH QUESTIONS! I need ALL calculations and explenations! please!

The diagonal AC in the quadrangle ABCD is simultaneously the diameter in the rewritten circle at the quadrangle. Let A1 be a perpendicular projection of A on the diagonal BD and let C1 be a perpendicular projection of C on BD. Show that BC1 is the same lenght as DA1. A quadrangle with circumference 2s is rewritten a circle with radius r. Show that the area of the quadrangle is equal to sr.

Answer 1

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nale las ben veoviten into iven a recda Ci Circle been rewnfen ...-. recho reale: circum erence ot circle Cr com เพ nce. D 2 rectargle A.rea 아 CrYC1L 2 S TTN ab ab Sr a b Arao o) rectangle with sides oleng a and b ove area ab Sr