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blsea [12.9K]
4 years ago
15

Need help with two questions I am not good with this

Mathematics
1 answer:
pogonyaev4 years ago
4 0

Answer:

Part 12) Center\ (2,-3),r=2\ units, (x-2)^2+(y+3)^2=4

Part 13) m\angle ABC=47^o

Step-by-step explanation:

Part 12) we know that

The equation of a circle in center-radius form is equal to

(x-h)^2+(y-k)^2=r^2

where

(h,k) is the center of the circle

r is the radius of the circle

In this problem

Looking at the graph

The center is the point\ (2,-3)

The radius is r=2\ units

substitute in the expression above

(x-2)^2+(y+3)^2=2^2

(x-2)^2+(y+3)^2=4

Part 13) we know that

The measure of the external angle is the semi-difference of the arcs it covers.

so

m\angle ABC=\frac{1}{2}[arc\ DE-arc\ AC]

we have

arc\ DE=142^o

arc\ AC=48^o

m\angle ABC=\frac{1}{2}[142^o-48^o]

m\angle ABC=47^o

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