Question

2. How much distance will be covered by a minute hand of a circular clock in 24 revolutions, If length of the minute hand is 1.4 cm. *
options:
(1) 17.6 cm
(2) 211.2 cm
(3) 33.6 cm

Answer 1

Answer:

Arna thabhairt:

△ Tá ABC dronuilleach ag C, ∠B = 60∘

∠C = 90∘

Tá a fhios againn é sin,

I dtriantán ABC, ∠A + ∠B + ∠C = 180∘

60∘ + ∠A + 90∘ = 180∘

∠A = 30∘

Tá againn,

sinA = ABCB

sin30∘ = 15CB

21 × 15 = CB

CB = 7.5 aonad

Ó Pythag