honeycoffee
honeycoffee
16-06-2017
Mathematics
contestada
Please help me, this is frustrating!
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jdoe0001
jdoe0001
17-06-2017
check the picture below
for the DB length, make sure your calculator is in Degree mode, since the angles are in degrees.
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mreijepatmat
mreijepatmat
17-06-2017
a) mes ∠ DAB) = mes ARC DAB/2
if mes ARC DAB = 40° , then mes DAB = 20
b) ∠ BDA is inscribed in half cercle, so its mesure is 90°
c) ∠DBA =90° - 20° = 70° (COMPLEMENTARY angles in a right triangle)
d) LENGTH OF ARC DB:
The central angle DCB = mes ARC DB = 40°;
Arc LENGTH = (40°) * (2πR)/360°, with R = 12 and π ≈ 3.14
Arc Length = (40°)*2*3.14*12/360 = 8.37 CM
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