exam Maths Puzzle Numerical Ability

ABC is a triangle. ABD is a triangle within triangle ABC. Angle DBA is congruent to angle ACB.

Prove (AC)(AD)= (AB)squared.

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exam Other Question

James is a salesperson for an electronics company. He may choose to receive $500 or 5% commission on his sales as payment for his work. How much does he need to sell to make the write the complex number 2 + the radical sign with 3j in trigonometric form. Give the angle to the nearest o.1 degree.