Em um ponto (O), distante horizontalmente 160 m da base de uma torre, o ângulo de elevação (α) para o topo da torre é 40°20'. Determinar a altura da torre, em relação ao nível do solo.

420/69/20

Step-by-step explanation:

80° is the measure of gh

step-by-step explanation:

circle f is congruent to circle j

we have two circle with center f and j.

both circles are congruent. the radius of the circle would be equal.

see the attachment for the circle.

we are given ∠efd ≅ ∠gjh

therefore, arc (ed) = arc (gh)     (∴ circle f is congruent to circle j)

but ∠dfe=80°=arc (ed)

therefore, arc (gh) = 80°

thus, 80° is the measure of gh

the answer would be  

a.

3: 1

step-by-step explanation: