book Maths Puzzle Numerical Ability

A wire of length 17cm is bent to make an isoceles triangle with base length of 6cm. What is the area of this triangle? Please help me with the steps and the formula.
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what is the answer for: d=10+5t-1/2(10)t(squared) t=(2,6)
you have to make a t-chart to solve.
thank you Need help with the following:

Suppose that a polynomial function of degree 4 with rational coefficients has -1, 0, and 2 - 3i as zeros. What is the remaining zero?