Mathematics Question and Solution
Sir Mike Ambrose is the author of the question.
Let the two equal lengths of the isosceles triangle be 2 units.
Therefore;
Area triangle ABC is
= 2sin36 square units.
= 1.17557050458 square units.
Area green is;
Area triangle with lengths 0.93931804148 units and 0.51440724841 units, and angle 63°, the angle they form.
= ½(0.93931804148*0.51440724841)sin63
= 0.21526361627 square units.
It implies;
Area Green ÷ Area Isosceles Triangle ABC to 2 d.p. is;
0.21526361627 ÷ 1.17557050458
= 0.18311416919
≈ 0.18
