Hi there!
Th' following triangle is divided into 2 sub-triangles!
• In 1ˢᵗ triangle :-
tan 45° =
⇒ 1 =
⇒
= 5
• In 2ⁿᵈ triangle :-
cos 30° =
⇒
= 
⇒
= 2 × 5
⇒ = 10
Hence,
Th required answer is 10 units.
~ Hope it helps!
Th' following triangle is divided into 2 sub-triangles!
• In 1ˢᵗ triangle :-
tan 45° =
⇒ 1 =
⇒
• In 2ⁿᵈ triangle :-
cos 30° =
⇒
⇒
⇒
Hence,
Th required answer is 10 units.
~ Hope it helps!