Which of the following is formed by the intersection of two planes?
a- a line
b- a ray.
c- a point
d- a line segment.

A- a line

Step-by-step explanation:

A plane is like a paper sheet , when we intersect a sheet by other sheet , we will observe that the intersection is a line ( as we given in the attachment).

Hence, the intersection of two planes is a line.

Therefore , the the correct answer is Option A - a line

find the magnitude of the trig term  

csc

(

x

)

−

1

by taking the absolute value of the coefficient.

1

find the lower bound of the range.

tap for more

y

=

−

2

find the upper bound of the range.

tap for more

y

=

0

the range is  

y

≤

−

2

or  

y

≥

0

.

(

−

∞

,

−

2

]

∪

[

0

,

∞

)

{

y

|

y

≤

−

2

,

y

≥

0

}

step-by-step explanation:

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true