Csc theta=-2 then theta equals csc^-1(-2) then theta would equal 5pi/6, 7pi/6
Step-by-step explanation:
expanded = 3n + 18
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since triangles are similar
4/x = 7x/7
=》 4/x = x
=》x^2 = 4
=》 x = 2
for right triangles a^2 = b^2+c^2
DF^2 = 7^2+2^2 = 53
=》 DF = 7.28
perimeter of DEF = 7 +2+7.28 = 16.28