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42°

Step-by-step explanation:

42° ?

qsr multiple by 2

9514 1404 393

  42°

Step-by-step explanation:

The exterior angle of a triangle is equal to the sum of the remote interior angles.

Angle y exterior to ΔQSR is ...

  y = x +21°

Angle 2y exterior to ΔQPR is ...

  2y = 2x +∠QPR

Solving for ∠QPR, we have ...

  ∠QPR = 2(y -x) . . . . . subtract 2x from the second equation

Comparing to the first equation, we find ...

  21° = y -x . . . . . . . . . . subtract x from the first equation

Substituting for y-x, we get ...

  ∠QPR = 2(21°) = 42°

your answer is 228

step-by-step explanation:

add the top and bottom bases together, then divide them by 2, then multiply by the height.

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have