Question

The length of a picture frame is 80 cm and its diagonal is 100 cm . find its perimeter .​

Answer 1

Step-by-step explanation:

By Pythagoras theorem the other side is 60cm

The perimeter =2( l + b)

=2(60 + 80)

= 2(140)

= 280cm

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Answer 2

280cm

Step-by-step explanation:

other side =

By Pythagoras Theorem.

$\sqrt{ {100}^{2} - {80}^{2} } \\ = )\sqrt{10000 - \: 6400 } \\=) \sqrt{3600} \\ = )60cm$

perimeter = 2(l+b)

=2(80+60)

=2 × 140

= 280 cm