Three measurements are made as 18.425 cm, 7.21 cm and 5.0 cm. The addition should be written as (A) 30.635 cm (B) 30.64 cm (C) 30.63 cm (D) 30.6 cm​

(D) 30.6 cm

Explanation:

Given the following data;

Measurement A = 18.425 cm

Measurement B = 7.21 cm

Measurement C = 5.0 cm.

To find the total measurement;

Total measurement = A + B + C

Total measurement = 18.425 + 7.21 + 5

Total measurement = 30.635 cm

However, an additional sum requires that all the numbers have a equal number of decimal points; 1 decimal point for 5.0 would be chosen.

Hence, we would round up the answer to 1 decimal point.

Total measurement = 30.6 cm

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explanation:

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.