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Intermediate

The commons

Two touching circles and a common tangent. Three triangles are formed by tangency points and centres. What is the area of the green triangle X in terms of areas A and B?

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Solution

The area X=2√(AB).

Solution by 発音 た゜.

Poem

The commons
Common like a shooting star
Brightening
Team working
Bringing
People together
Other cultures
Other countries
Other religions
Other politics
Millions of stars
But only one sky
Together they work and live
Together they take and give
In a place where they can grow

Bella

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