Estimating Sun's Diameter & Earth's Radius: 2 Questions in Physics

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SUMMARY

This discussion focuses on two physics problems: estimating the Sun's diameter using a meter stick and paper, and determining the Earth's radius by observing sunset times from different heights. The first problem utilizes the known distance from the Earth to the Sun (1.50 x 1011 m) to create a simple geometric relationship. The second problem involves measuring the time difference in sunsets while lying down versus standing, which can be used to calculate the Earth's radius based on the observer's height change.

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Indigo Prophercy
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I got these 2 questions for homework and i can't figure them out.

Number 1 is With only a metre-stick, a piece of paper and the knowledge that the sun is 1.50 x 10^11m from the earth, how can one estimate the suns diameter.

Number 2 is You can watch the sun set and disappear over a calm ocean while you lie on the beach, then once again if u stand up. Determine an approximate value of the Earth's radius. Measuring the time between the 2 sun sets.

If anyone can help i would be so thankful!
 
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