I'll mark you brainliest for the right answer! 20 points

One way is to first find the measure of one external angle:-

Measure 1 ext angle = 360 / 10 = 36 degrees (Note the sum of the external angles of all polygons is 360  degrees)

So the internal angle = 180 - 36 = 144

So sum of the internal angles

= 10 * 144

= 1440  degrees (answer)

decagon

All sides are the same length (congruent) and all interior angles are the same size (congruent).

To find the measure of the angles, we know that the sum of all the angles is 1440 degrees (from above)...  And there are ten angles...

decagons

So, the measure of the angle of a regular decagon is 144 degrees.sum of exterior angles always=360°

for n-sided polygon,

sumo of exterior angles+sum of interior angles =180×n°

sum of interior angles=180n° -360°=180n°-180°×2=180(n-2)°

For decagon, n=10,

sum of its interior angles =180×10°–360°=1800°–360°= 1440°

so your answer is 1440°

ratios represent a pattern or relationship that can be scaled.

equivalent ratios are pairs of ratios that represent the same relationship between quantities, and can be generated by multiplying or dividing both quantities in the ratio by the same factor.

in this lesson, students will use double number lines and ratio reasoning to solve ratio problems. by partitioning double number lines into proportionate intervals, students will build an understanding of equivalent ratio relationships as those that are generated by multiplying or dividing two related quantities by the same number. this lesson will build upon students' prior understanding of multiplicative comparisons, number line reasoning and equivalent fractions (while highlighting the difference between equivalent fractions and equivalent ratios); and will build toward future work in this unit on building ratio tables, and work in future grades in proportionality, scaling, and expressing and graphing linear functions.

step-by-step explanation:

ratios represent a pattern or relationship that can be scaled.

equivalent ratios are pairs of ratios that represent the same relationship between quantities, and can be generated by multiplying or dividing both quantities in the ratio by the same factor.

in this lesson, students will use double number lines and ratio reasoning to solve ratio problems. by partitioning double number lines into proportionate intervals, students will build an understanding of equivalent ratio relationships as those that are generated by multiplying or dividing two related quantities by the same number. this lesson will build upon students' prior understanding of multiplicative comparisons, number line reasoning and equivalent fractions (while highlighting the difference between equivalent fractions and equivalent ratios); and will build toward future work in this unit on building ratio tables, and work in future grades in proportionality, scaling, and expressing and graphing linear functions.

the battle of gettysburg is considered the "high water mark" of the confederacy because it marked the greatest advance of the confederate forces against the union.