46 degrees 53 minutes + 27 degrees 7 seconds= quickly

46 degrees 53 minutes + 27 degrees 7 seconds= quickly

46 + 27 degrees 54 minutes 7 seconds, you remember 60 carry is

If ∠ AOB = 75 ° 18 ′, ∠ AOC = 27 ° 53 ′, then ∠ BOC=______ ．

When OC is outside ∠ AOB, then ∠ BOC = ∠ AOB + AOC = 75 ° 18 ′ + 27 ° 53 ′ = 102 ° 71 ′ = 103 ° 11 ′; when OC is inside ∠ AOB, then ∠ BOC = ∠ AOB - AOC = 75 ° 18 ′ - 27 ° 53 ′ = 74 ° 78 ′ - 27 ° 53 ′ = 47 ° 25 ′. So the answer is 103 ° 11 ′ or 47 ° 25 ′

As shown in the figure, it is known that ∠ a = 27 °, CBE = 90 °, C = 30 ° and the degree of ∠ D is calculated

∵∠CBE=90°，∠C=30°，∴∠CEB=180°-90°-30°=60°，∵∠A+∠D=∠CEB，∴∠D=∠CEB-∠A=60°-27°=33°．