Question

Calculate the angle marked with letters . O is tge centre of the circle wherever given :-

plz i want step by step answer !!

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Answer 1

${\huge{\bold{\fbox\pink{Hi \: Sis!}}}}$

$\small\green{here \: is \: your \: answer!}$

1. 2x = 120 (angle at centre twice the angle at circumference)

x = 120/2

x = 60

$\blue{a = 60°}$

3. 2x = 260 (angle at centre twice the angle at circumference)

x = 260/2

x = 130

$\blue{x = 130°}$

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Answer 2

Answer:

Phosphine (IUPAC name: phosphane) is a colourless, flammable, very toxic gas compound with the chemical formula PH3, classed as a pnictogen hydride. Pure phosphine is odourless, but technical grade samples have a highly unpleasant odour like rotting fish, due to the presence of substituted phosphine and diphosphane (P2H4). With traces of P2H4 present, PH3 is spontaneously flammable in air (pyrophoric), burning with a luminous flame. Phosphine is a highly toxic respiratory poison, and is immediately dangerous to life or health at 50 ppm.

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