Rays DA and DC are perpendicular. Point B lies in the interior of

Question

∠
A
D
C
.
If
m
∠
A
D
B
=
(
3
a
+
10
)
°
and
m
∠
B
D
C
=
13
a
°
,
find a,
m
∠
A
D
B
,
and
m
∠
B
D
C
.

Answer 1

S
e
e

h
o
w

a
n
n
o
y
i
n
g

v
e
r
t
i
c
a
l

t
e
x
t

i
s
?