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Determine the best answer
6 points
MULTIPLE CHOICE Find the length of BC. (Lesson 10-2)
B
21 cm
C
168°
A 18°
C 168°
B 2.20 cm
D 30.79 cm
A

Determine the best answer 6 points MULTIPLE CHOICE Find the length of BC Lesson 102 B 21 cm C 168 A 18 C 168 B 220 cm D 3079 cm A class=

Respuesta :

Let’s assume the point in the centre is the origin of the circle.

This means the radius is 21/2 = 10.5cm.

180 - 168 = 12 degrees as the angle between BC.

Circumference of a sector is:

Angle/360 • pi • diameter

=12/360 • pi • 21 cm

= 2.19 cm = 2.20 cm

Which is option B
yeniklinawati

Answer:

angle of bc= 180-168= 12°

length of bc= 12/360 × π × diameter

= 12/360 × 22/7 × 21

= 12/360 × 66

= 2,20 cm (b)

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