<Dl> <Dd> <Dl> <Dd> (a) tan ⁡ α = a cos ⁡ φ δ λ a δ φ, (\ displaystyle (\ text ((a))) \ quad \ tan \ alpha = (\ frac (a \ cos \ phi \, \ delta \ lambda) (a \, \ delta \ phi)),) </Dd> <Dd> (b) tan ⁡ β = δ x δ y = a δ λ δ y . (\ displaystyle (\ text ((b))) \ quad \ tan \ beta = (\ frac (\ delta x) (\ delta y)) = (\ frac (a \ delta \ lambda) (\ delta y)).) </Dd> </Dl> </Dd> </Dl> <Dd> <Dl> <Dd> (a) tan ⁡ α = a cos ⁡ φ δ λ a δ φ, (\ displaystyle (\ text ((a))) \ quad \ tan \ alpha = (\ frac (a \ cos \ phi \, \ delta \ lambda) (a \, \ delta \ phi)),) </Dd> <Dd> (b) tan ⁡ β = δ x δ y = a δ λ δ y . (\ displaystyle (\ text ((b))) \ quad \ tan \ beta = (\ frac (\ delta x) (\ delta y)) = (\ frac (a \ delta \ lambda) (\ delta y)).) </Dd> </Dl> </Dd> <Dl> <Dd> (a) tan ⁡ α = a cos ⁡ φ δ λ a δ φ, (\ displaystyle (\ text ((a))) \ quad \ tan \ alpha = (\ frac (a \ cos \ phi \, \ delta \ lambda) (a \, \ delta \ phi)),) </Dd> <Dd> (b) tan ⁡ β = δ x δ y = a δ λ δ y . (\ displaystyle (\ text ((b))) \ quad \ tan \ beta = (\ frac (\ delta x) (\ delta y)) = (\ frac (a \ delta \ lambda) (\ delta y)).) </Dd> </Dl> <Dd> (a) tan ⁡ α = a cos ⁡ φ δ λ a δ φ, (\ displaystyle (\ text ((a))) \ quad \ tan \ alpha = (\ frac (a \ cos \ phi \, \ delta \ lambda) (a \, \ delta \ phi)),) </Dd>

What does the scale on a map mean