Measuring the earth

What did ancient philosophers observe during a lunar eclipse that suggested Earth was round?

• The sun was blocked.

• The Earth cast a circular shadow on the moon.

• The stars disappeared.

• The moon turned red.

What tool did Beruni use to measure angles for his calculations?

• An astrolabe

• A compass

• A telescope

• A ruler

How did Beruni calculate the height of the mountain?

• By estimating based on the mountain's shadow

• By using the angles and distance between two points

• By climbing it and measuring with a rope

• By asking local villagers

What shape did Beruni imagine to help calculate the Earth's radius?

• A rectangle

• A right angle triangle

• A circle

• A square

What was the approximate circumference of the Earth calculated by Beruni?

• 30,000 kilometers

• 40,000 kilometers

• 50,000 kilometers

• 60,000 kilometers