exam Maths Puzzle Numerical Ability

I am really confused with this homework problem.

I have two triangles that are congruent. The first triangle's measures are the sides of AB=13, AC=x(unknown), and the base BC=

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exam Other Question

Use the determinant to determine whether the quadratic equation has two unequal real solutions, a double real solution or no real solution without solving the equation: x^2-2x+2=0 The area of triangle ABC is 20 square units. If angle A = 130o and b = 6, find the value of c.