The little triangle is the Greek letter delta, and it means change. This shows up in chemical equations in particular, used to indicate a change in energy as a product of a reaction.
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The measures of two angles in a triangle are shown in the diagram. Which equation can be used to find the value of x?
because the answer of the equation can be aranged into a triangle.
The equation for the area of a triangle is (base*height)/2. So with your particular numbers you just plug them into the equation to obtain that (5*4)/2 = 20/2 = 10un^2
I assume you mean an equilateral triangle. An equilateral triangle is a triangle with all three sides the same length (and therefore all three angles the same as well).
An equilateral triangle is one in which all three sides are of the same length.