Given AB on the square lattice.
(a) How many triangles can be drawn that have AB as a side?
(b) How many of these triangles are isosceles triangles?
(c) How many of these triangles are acute triangles?
(d) How many of these triangles are right triangles?
(e) How many of these triangles are obtuse triangles?
(a)21
(b) 4
(c) 5
(d) 6
(e) 10
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.
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Rewrite the expression as a sum or difference, then simplify if possible.
?
?
A. 
B. ?
C. ?
D. ?
E. ?