Answer: contour lines.
Topographic maps are easily recognized by their contour lines.
Answer:
![\angle RST =110](https://tex.z-dn.net/?f=%5Cangle%20RST%20%3D110)
Explanation:
Given
![\angle RPT = 70](https://tex.z-dn.net/?f=%5Cangle%20RPT%20%3D%2070)
See attachment
Required
Find ![\angle RST](https://tex.z-dn.net/?f=%5Cangle%20RST)
To do this, we make use of the following theorem
--- angle at the center and angle between two tangents add up to 180 (i.e. they are supplementary angles)
So, we have:
![\angle RST + 70 = 180](https://tex.z-dn.net/?f=%5Cangle%20RST%20%2B%2070%20%3D%20180)
Collect like terms
![\angle RST =- 70 + 180](https://tex.z-dn.net/?f=%5Cangle%20RST%20%3D-%2070%20%2B%20180)
![\angle RST =110](https://tex.z-dn.net/?f=%5Cangle%20RST%20%3D110)
Nuclear fusion generates the energy that is released by stars.
In the great majority of stars, it's the fusion of hydrogen nuclei
to form helium nuclei plus energy. In very old stars, the nuclei
of heavier elements are fused, forming even heavier ones.