Question 841098
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Hi,
isosceles triangle with a base that is 8 units long and side lengths 5 units long?
{{{drawing(300,300,   -10,10,-5,5,  
 grid(1),
circle(8,0,0.4),
circle(4,0,0.4),
circle(4,3,0.4),
line(0,0,4,3),
line (8,0,4,3),
line (4,3,4,0),
locate(1.5,2,"5"),
locate(6,2,"5"),
graph( 300, 300, -10,10,-5,5))}}}
Applying Pythagorean Theoerm
 h = {{{sqrt(25-(8/2)^2) = 3}}}
height = 3 units 
 A = {{{(1/2)bh = (1/2)(8)(3) = 12units^2 }}}