Объяснение:
S=(4×r^2)/sin( альфа) =
=(4×4^2)/sin30=4×16:1/2=64×2=128 см^2
Или:
Н=2r
S=H^2/sin (Aльфа) =
=(2r)^2/ sin30=4r^2:1/2=4r^2×2=
=4×4^2×2=4×16×2=128 cм^2
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Объяснение:
S=(4×r^2)/sin( альфа) =
=(4×4^2)/sin30=4×16:1/2=64×2=128 см^2
Или:
Н=2r
S=H^2/sin (Aльфа) =
=(2r)^2/ sin30=4r^2:1/2=4r^2×2=
=4×4^2×2=4×16×2=128 cм^2